Energy, History, Magnetism, Mechanics, Motors, Museums, Power systems, Visits

Technical Museum Nikola Tesla (Part 1)

I was in Zagreb, Croatia’s capital and visited the Technical Museum Nikola Tesla. It is a huge museum and this is the first part of series.

Entrance to museum is by middle door.

Entrance of Nikola Tesla Museum

Firefighting area

Firefighter area

It’s close to entrance of Technical Museum Nikola Tesla. In this area, are shown vehicles and equipment used by Fire Brigade Zagreb and Volunteer Fire Company. A manual fire pump with double-cylinder, used around 1900.

Manual fire pump

An educational panel explains conditions to have fire: Oxygen, fuel material and material’s ignition temperature. Each switch on left represents one of these conditions. When 3 conditions are met, central light representing fire is on.

Conditions of fire

This flag marked the control point of fire fighting operation. At night, were implemented lamps.


A water supply wagon moved by horse. Had capacity for 450 liters.

Water supply wagon

Rucksack for firefighting V-25, could carry up to 25 liters of water.


Another double cylinder manual pump, also used around 1900.

Manual pump

An adjustable nozzle, were installed on top of a ladder to erase fire in high buildings.


This is a Magirus K 20, used in 1924. Ladder can be extended to 30 meters. The engine had 4 cylinders and was cooled by water. In addition to 50 kW at 1100 rpm.

A centrifugal water pump from Fiat, with four cylinder petrol engine and cooled by water.

Motor fire pump

Protection equipment for firefighters. From late 19th century and 1920s.

Helmets and breathing

Tempex suit
This suit is made of Tempex, protects against high temperatures reflecting heat radiation.

A wagon pushed by horses which transported a manual pump.

Wagon pump

These wagon carried firefighters to fire spot. Was used in the end of XIX century.

Fire crew carrier

In this section there are many types of fire extinguishers and pumps.

Fire extinguisher room

These vehicles transported firefighters and their equipment. A Chevrolet from 1931 and an Opel Blitz from 1939, respectively.



Opel Blitz

Opel Blitz

Energy conversion

Energy conversion room

This section has many old steam engines, combustion ones, hydro turbines and some electric machines. Not all are present in this post. This is a steam engine with a single horizontal cylinder.

Steam engine single cylinder

This is a centrifugal suction pump, manufactured by AEG in 1911.

Centrifugal suction pump

Francis hydro turbines of 8 kW and 110 kW, respectively.

8kW Francis

110kW Francis

19th century water mill.

Water mill

A Pelton turbine.


A boiler, produced steam to move engines’ pistons.


Steam engine with a single vertical cylinder. Both are double acting, by that, high pressure steam acts in both sides of piston to generate motion.

vertical steam engine
19th century with 45 HP (33.1 kW).
Vertical steam engine
Hungarian 1902 engine with 30 HP (22.1 kW).

Steam machine with a single cylinder double acting. Manufactured by Masch, Tanner, Laetsch & co in 1908 in Vienna, Austria. Touchscreen in red shows the machine in operation.

Steam engine

Steam engine

The steam engine is linked through a belt to a direct current generator model GM-265, whose nominal power is 30.5 kW. The latter was made by Siemens-Halske in past century.

DC generator

Two steam marine engines, to propulsion of ships and boats. Both have two double acting cylinders.

Steam marine engine
45 HP (33.1 kW) and was used in 1880.
Steam marine engine
1870 engine with 35 HP (25.7 kW).

A three phase synchronous generator model WI d 48/1000. Possess 48 KVA of aparente power, 400 V and was built by Siemens-Schuckert.

3 phase synchronous generator

2.9 kW single stage steam turbine of De Lavals.

Single stage steam turbine

A 1300 kW multistage steam turbine. Made by De Lavals in 1926.

Steam turbine blades

Multistage steam turbine

An air compressor of American Ingersoll Rand.

Air compressor

Marine four stroke diesel engine. Built by MWM, in Manheim, Germany. Has 250 HP (183.8 kW).

Diesel engine






About Pedro Ney Stroski

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