No. 258 (upper left), No. 252 (left), No. 147 (right)

 
Johnson multi-purpose furnaces incorporate various heat treating, drawing, and liquid bath furnaces into single units; versatility is thereby achieved at low cost in minimum floor space. Furnace blowers and piping are located beneath benches, to further utilize space.
 
NO. 252 TRIPLE-TREAT FURNACE
Compact combination unit provides a complete heat treating set-up including No. 568 pot type furnace for lead, cyanide, and salt hardening; No. 142 oven-type furnace for hardening carbon and high speed steels (temperature range of 1300° F. to 2350° F.), and No. 175 atmospheric drawing furnace (temperatures up to 1150° F.).
 
NO. 258 DUO FURNACE
This popular furnace combination includes the powerful Johnson No. 142 Oven Furnace for hardening (temp. range: 1300° F. to 2350° F.) and the Johnson No. 175 atmospherically fired furnace for pre-heating and drawing (temp. range: 400° F. to 1150° F.). Parts being heat treated can be easily transferred from one furnace to another.
 

NO. 136

NOS. 136 AND 147 MULTI-PURPOSE FURNACES
These compact multi-purpose furnaces were designed for school shops where floor space and budgets are limited. They combine all essential "hot metals" functions in one rugged, easy to operate furnace. They can be used for forging, soft metal melting, heat treating, and as crucible furnaces for melting aluminum and brass. Requiring minimum floor space, these new furnaces have low working height with the same rugged construction features of all Johnson Furnaces. Furnished with hearth plate, crucible support, lid, and lid lifting rod.