This “calculator” is made of a plastic cover (resembling a stock) and a cardboard piece with numbers (such as a slide). This calculator has the name “Dodge Calculator” at the top and the name of the company and branch as well as the company logo of both the front and back surfaces.
Accession Number: 2010.lej.39
Primary Materials: Cardboard
Old Inventory Number = 39.
“DODGE CALCULATOR FOR PULLEYS AND BELTS”
“Copyright 1905 by Dodge Mfg. Co.”
“POWER TRANSMISSION MACHINERY. DODGE MANUFACTURING COMPANY, TORONTO-MONTREAL.”
The â??scalesâ?? are in the form of a formulas.
On the front are scales for Dodge clutches (split sizes, H.P., solid sizes), bore limits for clutches, revolutions per
minute, shafting horse power (main shaft, diameter, line
shaft) (Copyright 1907).
On the back are scales for for pulleys and belts, revs. driver, pulley diameter, revs. driven and H.P. single belt, pulley face, H.P. double belt.
Length = 14.5 cm, Width = 7 cm, Height = 0.2 cm
A patent item designed to help buyers determine the sizes of pulleys, clutches and other manufacturing equipment.
Condition: Item is in very good condition.
Dodge Manufacturing Company, Toronto-Montreal. Power Transmission Machinery.
Date of Manufacture: 1909-1910
From the personal collection of L. E. Jones.
Additional Information and References:
The Dodge Manufacturing Company of Toronto, Ltd. was founded in 1886 and through a series of mergers, acquisitions and formation of new companies as finally formed as the North American Rockwell and most of its assets were sold in 1996.
The Dodge Calculator was patented on June 6, 1905.
An advertisement for this kind of slide rule
in a November, 1910 edition of Popular Mechanics shows the
price as 25 cents.
For further information about the Dodge company, please refer to http://www.library.hbs.edu/hc/lehman/chrono.html?company=north_american_rockwell_overseas_corporation.
For images of the early beginnings of its Toronto holdings, please refer to http://www.trainweb.org/oldtimetrains/
A sample catalogue can be viewed at http://books.google.com/books?id=B9YIGW-OYyEC&printsec=frontcover&source=gbs_summary_