My son is heading back to school soon and was deciding if he needed a math set for school. We call these "math sets" or "geometry sets" but they used to also be called "mathematical instruments". In the past, many of these old sets were made in England but a few were manufactured here in Canada.  In the May 1946 issue of Canadian Stationer, there is a short note about a Canadian made set of math instruments produced by Moss Instruments in Toronto. The Canadian Trade Index of 1954 has an advertisement for Moss Instruments as a manufacterer of school geometry instruments sets among other items.

My set shown below has a 30/60 triangle, 45/90 triangle and protractor that all have "Made in Canada" and "M.I.L." printed on them (MIL being the initials of Moss Instruments Limited). The compass doesn't have any markings on it but it does have an old Venus Velvet pencil in it. I've seen other compasses in this style that say Dixon pencil. Perhaps Dixon had them made by MIL?

With a bit of digging I found the names of the four mathematical instruments sets that Moss Instruments made (in 1948). These are listed in order of expense with #1 being the highest priced.

• #1 Beaver Set
• #2 Dominion Set
• #3 Ottawa Set
• #4 Canadian Set

Stationery trade publications can be a valuable source of information. Articles and advertisements can help provide details about manufacturers. It can also help to date specific styles of pencils. 
The main stationery trade publication in Canada went by many names. Starting in 1884 the journal was called "Books and Notions". The name remained through 1895 (Volumes 1-11). In 1896 the name was changed to "Canada Bookseller and Stationer". This name lasted just two years (Volumes 12-13). In 1897 the name was shortened to "Bookseller and Stationer" (Volumes 14-23). From 1908 to 1910 it was called "Bookseller and Stationer and Canadian Newsdealer" (Volumes 24-26). From 1910 it was called "Bookseller and Stationer and Office Equipment Journal". 

Links to many of these issues can be found online:

• https://en.wikisource.org/wiki/Books_and_Notions

In 1946, with volume 62, the Bookseller and Stationer split into two different publications. Below are a few pages from the May issue of this monthly publication. I would love to find more copies. I believe this journal was published until at the least the late 1960s. 

Below are a couple of pencil advertisements from this journal.

Pope Pius XII was elected to the papacy on March 2nd, 1939. The pencil below was made by the Eagle Pencil Company in Drummondville to commemorate his election. Pope Pius never visited Canada but it turns out he appreciated this pencil and sent a delegation to the Eagle Pencil Company in thanks. 

H.E. Mgr. Ildebrado Antoniutti, Papal Delegate to Visit Drummondville
Distinguished Visitor Will Arrive March 5th. Reception to be Held In St. Frederick's Church. Special Visit To Eagle Pencil Company's Plant.
The Drummondville Spokesman 23 Feb 1940

Canon Georges Melançon created a stir of excitement during the course of his sermon last Sunday morning in St. Frederick’s Church when he announced the forthcoming visit of His Excellency, Mgr. Ildebrando Antoniutti, Papal Delegate to Canada and Newfoundland, to Drummondville early in March.

We learn that included in his heavy program will be a special visit to Mr. L. C. Felser and the personnel of the Eagle Pencil Company who have been instrumental in paving the way for the distinguished churchman’s visit.

Always on the alert to provide something new, it was only natural that the election of a new Pope should create the idea of commemorating the important event, and the Eagle Pencil Company of Drummondville proceeded to manufacture a quantity of pencils with the image of His Holiness, Pope Pius XII, imprinted on. These pencils were shipped to Rome and His Holiness was so delighted with the thought expressed that he requested the Papal Delegate to Canada to communicate with the Management of the Eagle Pencil Company, and extend the thanks of His Holiness and his expression of good wishes for the continued success of the Company.

The communication being duly received, Mr. Felser collaborated with Canon Melançon in arranging the visit of the Pope’s Representative to Drummondville.

His Excellency, Mgr. Antoniutti will arrive in Drummondville on Tuesday, March 5th and will be accompanied by His Excellency, Mgr. Albini Lafortune, Bishop of Nicolet. A reception in which it is hoped that the population of the region will take part, will be held at the town hall followed by a speech at St. Frederick’s Church.

On Wednesday morning, March 6th Mass will be celebrated by both the distinguished visitors who will then proceed to visit the different parishes of the district with a special visit to the Eagle Pencil Company. 

The citizens of Drummondville will, we feel sure, make the visit an occasion for rejoicing and one that will always be remembered.

H. E. Mgr. Ildebrando Antoniutti Receives Warm Welcome from Drummondville
Short Visit Fully Occupies Papal Delegate. His E. Shows Keen Intereste at Eagle Pencil Co.
The Drummondville Spokesman 8 Mar 1940
​
[...]
To the Eagle Pencil Company

A visit, previously arranged, was made to the Eagle Pencil Company’s factory here, where the party was received by Mr. L. C. Felser, manager.

Mgr. Antoniutti thanked Mr. Felser on behalf of the Pope for the splendid gift of pencils which were sent to the Vatican.

The Papal Delegate stated that there was no doubt that His Holiness had written His first encyclical with one of the pencils made in Drummondville. Mr. Felser escorted his distinguished guests through the factory and explaining the many fine and varied processes in the manufacture of pencils, to which His Excellency showed a keen interest.

Prior to his departure, the following local industrials managers were presented to Mgr. Antoniutti: Messrs. Russell A. Weaver, of the Butterfly Hosiery Company; E. A. McWilliam, the Canadian Marconi Company; Walter Needham, of the Drummondville Cotton Company; W. S. Gall, of the Dominion Silk Dyeing and Finishing Company; L. C. Leach, Dennison Manufacturing Company of Canada; Leo Surprenant, Eastern Paper Box Company; Robert Bernard, J. A. Gosselin Company; Klyne, of the Holt Rubber Company; Gustave Mercure, A. Fulhaber, of the Louis Roessel Company; A. C. Roux, of the Royal Canadian Velvets; and F. A. Chisholm of the Southern Canada Power Company. Mr. R. H. Sperling, of the Canadian Celanese Ltd., was out of town.

Mr. L. C. Felser was honoured with a portrait of His Excellency Mgr. Ildebrando Antoniutti, having been autographed with the following sentence: written in French --
“Témoignage de Reconnaissance pour Hommage à S. S. Pie XII, avec les Compliments du Délégué Apostolique”.

In return Mr. Felser presented Their Excellencies with beautiful pen and pencil sets in gold and several aspersoriums of his own design resembling a fountain pen.

Before leaving, His Excellency promised Mr. Felser that he will in near future again visit Drummondville.

The party entrained at the C.N.R. at 4 p.m. where a vast crowd congregated to view the distinguished visitors farewell.

Members of the party that toured the city were His Excellency, the Apostolic Delegate, Mgr. Albini Lafortune, Abbe Rene Denis, secretary to the Apostolic Delegate, Abbe Roberge, secretary to the Biship of Nicolet, Canon Georges Melancon, Abbe Poirier, Allard, J. N. Lessard and Desharnais.